Once subtracted Roy-like dispersion relations and a precise analysis of $\pi\pi$ scattering data

TL;DR

This paper advances the analysis of $$ scattering data by applying subtracted Roy-like dispersion relations and GKPY equations, achieving a precise, model-independent understanding constrained by fundamental principles.

Contribution

It introduces a novel combined analysis using subtracted Roy-like and GKPY equations to improve the precision of $$ scattering data interpretation.

Findings

GKPY equations provide a stringent consistency check for S0-wave data

The analysis yields a precise, model-independent description of $$ scattering data

Constraints from dispersion relations improve data parametrizations

Abstract

We report our progress on the data analysis of $\pi\pi$ scattering data in terms of Forward Dispersion Relations (FDR), as well as Roy equations (RE) and their once-subtracted counterpart, GKPY equations. The first part of the analysis consists of independent fits to the different $\pi\pi$ channels. The GKPY equations provide a more stringent consistency check for the parametrizations of the S0-wave data in the region from 400 to 1100 MeV, In the second part we present our preliminary analysis where the fits are constrained to satisfy all dispersion relations within errors, including the new GKPY Eqs., thus providing a very precise and model independent description of data using just analyticity, causality and crossing.